A decade of in situ cosmogenic 14C in Antarctica

IF 2.5 4区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Keir Alexander Nichols
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引用次数: 0

Abstract

Cosmogenic nuclide measurements in glacial deposits extend our knowledge of glacier chronologies beyond the observational record. The short half-life of in situ cosmogenic 14C makes it particularly useful for studying glacier chronologies, as resulting exposure ages are less sensitive to nuclide inheritance when compared with more commonly measured, long-lived nuclides. An increasing number of laboratories using an automated process to extract carbon from quartz has led to in situ 14C measurements in Antarctic samples at an accelerating rate over the past decade, shedding light on deglaciation in Antarctica. In situ 14C has had the greatest impact in the Weddell Sea Embayment, where inferences on the thickness of ice and timing of deglaciation were limited by inheritance in other cosmogenic nuclide systems. Future subglacial measurements of the nuclide hold much potential as they can provide direct evidence of proposed Holocene thinning and subsequent re-thickening of parts of the Antarctic ice sheets.

南极洲十年来的原位宇宙成因14C
冰川沉积物中的宇宙核素测量扩展了我们对冰川年代学的认识,超出了观测记录。原位宇宙成因14C的半衰期短,这使得它对研究冰川年代学特别有用,因为与更常见的长寿命核素相比,由此产生的暴露年龄对核素遗传的敏感性较低。在过去的十年中,越来越多的实验室使用自动化过程从石英中提取碳,从而加速了南极样品中14C的原位测量,从而揭示了南极洲冰川消融的情况。原位14C对威德尔海海堑的影响最大,在那里对冰的厚度和冰川消融的时间的推断受到其他宇宙成因核素系统遗传的限制。未来对核素的冰下测量具有很大的潜力,因为它们可以提供提出的全新世南极冰盖变薄和随后部分冰盖再增厚的直接证据。
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来源期刊
Annals of Glaciology
Annals of Glaciology GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
8.20
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Annals of Glaciology publishes original scientific articles and letters in selected aspects of glaciology-the study of ice. Each issue of the Annals is thematic, focussing on a specific subject. The Council of the International Glaciological Society welcomes proposals for thematic issues from the glaciological community. Once a theme is approved, the Council appoints an Associate Chief Editor and a team of Scientific Editors to handle the submission, peer review and publication of papers.
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